Here you get all information about the care and maintenance of your Böhm Stirling engines.

. . .

Maintenance piston cleaning for vacuum engines

In these models, dirt builds up in the interior, so the cylinder inside and the working piston must occasionally be cleaned. The working piston is then oiled lightly and thinly with Aeroshell fluid 12

Squeaking with flame lickers (HB22 + HB24), this is normal due to the friction bearing. If  it should become too annoying, loosen the working piston from the piston

holder and twist it by about 30°, then retighten it with the fork wrench 5.5mm so that the piston has a different angular position.

The use of other lubricants and fuels will void your warranty!

Click for help on Point 6, Point 7 or Point 9 (engine does not start).